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Lowering my c4



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stuart2379

Regular

Thu 16 Nov 17 08:59

Lowering my c4


Morning

Love my 1989 l98 corvette. What is the best way to lower the suspension? Is it worth doing? Any recommendations of where to go? It's not something I can or want to do myself. Any help appreciated. Also any ideas for upgrading the wheels? Worth it and where to go? Like to keep my options open.

Stuart



Last edited by stuart2379 on Thu 16 Nov 17 09:05; edited 1 time in total. [18 %]

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Redlevel

Club Member

Thu 16 Nov 17 10:45

Re: Lowering my c4


I wouldn't be lowering it as its low enough already, but you can improve the cornering by simple adjustments to the front geometry..

Read this for a better explanation. I did mine in about 30mins (still had to get it re-tracked though) and added about 1.5deg of -ve camber and more +ve caster. I can corner faster as it feels more planted, but this is now showing up the crap tyres I use on the rear and occasional drifting on the commute can be unexpected! Surprised

http://www.superchevy.com/how-to/vemp-0012-wheel-alignment-c...

There are a lot of wheels around so it depends on what will fit and what you like, but just make sure the tyres are available. I run 16x10 BBS's all round with super rare 295/50x16's on the back. If these tyres dry up I'll switch down to 15" wheels as I do not like the spokey "gun carriage" wheels that are so common these days, but its a personal choice what you like.

Image



Last edited by Redlevel on Thu 16 Nov 17 10:49; edited 1 time in total. [14 %]

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chevrolet

Club Member

Thu 16 Nov 17 13:32

Re: Lowering my c4


stuart2379 wrote (View Post):Morning

Love my 1989 l98 corvette. What is the best way to lower the suspension? Is it worth doing? Any recommendations of where to go? It's not something I can or want to do myself. Any help appreciated. Also any ideas for upgrading the wheels? Worth it and where to go? Like to keep my options open.

Stuart


Guess it depends on what you are trying to achieve? Looks, ride, handling changes? If you have a car with the Z51 (sports) suspension option, it rides pretty firm as it is, No?

Obviously, putting on bigger diameter wheels, and potentially skinnier sidewall depth tyres, is going to affect the ride quality (and handling and "rattles") (?)

Look on the Ecklers and Mid America (and others) websites for C4 lowering kits. Its bolts for the back and wedges for the front, if I remember correctly. Keith at Eurovettes will be able to get them for you:

http://www.eurovettes.com/

Don't know if there is anyone in the club on here, who has a lowered/big wheel C4? But must admit, think this one in Picture 1, looks pretty cool?

http://www.corvetteclub.org.uk/viewtopic.php?t=18761

Must admit, first thing I would be spending my money on, is a CCCUK subscription, if only for the insurance discounts and excellent club magazine etc etc.



Last edited by chevrolet on Thu 16 Nov 17 14:21; edited 2 times in total. [21 %]
--------------------
AKA "Silver C6" on Pistonheads

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FelixP

Addict

Thu 16 Nov 17 15:33

Re: Lowering my c4


I bought the wedge & bolt kit and paid my mechanic to lower it for me. I'll write up a more in-depth post later. My wishbones now have black polybushes too, look stock. No squeaks or rattles and a much crisper turn in. It's not slammed but it doesn't have that goofy wheel arch gap either.

Image

Image


--------------------
1989 Corvette C4 L98 6 speed ZF with Z51 & FX3

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Redlevel

Club Member

Thu 16 Nov 17 17:10

Re: Lowering my c4


I find this odd..

Why would GM have the C4 with a +ve camber from stock? Confused

The C4 factory specifications call for a slight outward tilt, or positive camber, while the C5s use a very slight negative camber, with the top of the wheel tilted inwards.

..anyway, its an easy adjustment to turn it -ve, but you'll only get about 1-1.5deg. If you do this, remember to measure the shims you remove from each side of the wishbone and bag and label them. You'll find they aren't equal on each side, so remember to factor that in when removing them to allow the top wishbone to move inboard.

A long 18mm socket and a decent open box 18mm spanner is all you need.

I worked it out to increase +ve caster too as you can't have enough of that stuff..

Image

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stuart2379

Regular

Thu 16 Nov 17 20:06

Re: Lowering my c4


FelixP wrote (View Post):I bought the wedge & bolt kit and paid my mechanic to lower it for me. I'll write up a more in-depth post later. My wishbones now have black polybushes too, look stock. No squeaks or rattles and a much crisper turn in. It's not slammed but it doesn't have that goofy wheel arch gap either.

Image

Image


Your car looks excellent. That is exactly the look Iím after. Itís more for looks than anything else. I have always felt a car with nice wheels and ath the correct height can look really good.

Stuart

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